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sd-rtnl: add support for nested containers

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This commit is contained in:
Tom Gundersen
2014-01-24 18:44:03 +01:00
parent c552d2e18b
commit 5a081409c5
3 changed files with 31 additions and 19 deletions
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2
src/libsystemd/sd-rtnl/rtnl-internal.h
View File

@@ -83,6 +83,8 @@ struct sd_rtnl {
#define RTNL_WQUEUE_MAX 1024
#define RTNL_RQUEUE_MAX 64*1024
#define RTNL_CONTAINER_DEPTH 32
int message_new_synthetic_error(int error, uint32_t serial, sd_rtnl_message **ret);
uint32_t message_get_serial(sd_rtnl_message *m);
int message_seal(sd_rtnl *nl, sd_rtnl_message *m);

41
src/libsystemd/sd-rtnl/rtnl-message.c
View File

@@ -35,13 +35,14 @@ struct sd_rtnl_message {
RefCount n_ref;
struct nlmsghdr *hdr;
size_t container_offset; /* offset from hdr to container start */
size_t container_offsets[RTNL_CONTAINER_DEPTH]; /* offset from hdr to each container's start */
unsigned n_containers; /* number of containers */
size_t next_rta_offset; /* offset from hdr to next rta */
bool sealed:1;
};
#define CURRENT_CONTAINER(m) ((m)->container_offset ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->container_offset) : NULL)
#define GET_CONTAINER(m, i) (i < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->container_offsets[i]) : NULL)
#define NEXT_RTA(m) ((struct rtattr*)((uint8_t*)(m)->hdr + (m)->next_rta_offset))
#define UPDATE_RTA(m, new) (m)->next_rta_offset = (uint8_t*)(new) - (uint8_t*)(m)->hdr;
@@ -373,11 +374,13 @@ static int add_rtattr(sd_rtnl_message *m, unsigned short type, const void *data,
struct nlmsghdr *new_hdr;
struct rtattr *rta;
char *padding;
unsigned i;
assert(m);
assert(m->hdr);
assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len);
assert(!data || data_length > 0);
assert(data || m->n_containers < RTNL_CONTAINER_DEPTH);
/* get the size of the new rta attribute (with padding at the end) */
rta_length = RTA_LENGTH(data_length);
@@ -394,16 +397,16 @@ static int add_rtattr(sd_rtnl_message *m, unsigned short type, const void *data,
/* get pointer to the attribute we are about to add */
rta = (struct rtattr *) ((uint8_t *) m->hdr + m->hdr->nlmsg_len);
/* if we are inside a container, extend it */
if (CURRENT_CONTAINER(m))
CURRENT_CONTAINER(m)->rta_len += message_length - m->hdr->nlmsg_len;
/* if we are inside containers, extend them */
for (i = 0; i < m->n_containers; i++)
GET_CONTAINER(m, i)->rta_len += message_length - m->hdr->nlmsg_len;
/* fill in the attribute */
rta->rta_type = type;
rta->rta_len = rta_length;
if (!data) {
/* this is the start of a new container */
m->container_offset = m->hdr->nlmsg_len;
m->container_offsets[m->n_containers ++] = m->hdr->nlmsg_len;
} else {
/* we don't deal with the case where the user lies about the type
* and gives us too little data (so don't do that)
@@ -437,8 +440,8 @@ int sd_rtnl_message_append_string(sd_rtnl_message *m, unsigned short type, const
case RTM_SETLINK:
case RTM_GETLINK:
case RTM_DELLINK:
if (CURRENT_CONTAINER(m)) {
if (CURRENT_CONTAINER(m)->rta_type != IFLA_LINKINFO ||
if (m->n_containers == 1) {
if (GET_CONTAINER(m, 0)->rta_type != IFLA_LINKINFO ||
type != IFLA_INFO_KIND)
return -ENOTSUP;
} else {
@@ -485,12 +488,13 @@ int sd_rtnl_message_append_u16(sd_rtnl_message *m, unsigned short type, uint16_t
case RTM_SETLINK:
case RTM_GETLINK:
case RTM_DELLINK:
switch (type) {
case IFLA_VLAN_ID:
break;
default:
return -ENOTSUP;
}
if (m->n_containers == 2 &&
GET_CONTAINER(m, 0)->rta_type == IFLA_LINKINFO &&
GET_CONTAINER(m, 1)->rta_type == IFLA_INFO_DATA &&
type == IFLA_VLAN_ID)
break;
else
return -ENOTSUP;
break;
default:
return -ENOTSUP;
@@ -710,12 +714,13 @@ int sd_rtnl_message_open_container(sd_rtnl_message *m, unsigned short type) {
uint16_t rtm_type;
assert_return(m, -EINVAL);
assert_return(!CURRENT_CONTAINER(m), -EINVAL);
sd_rtnl_message_get_type(m, &rtm_type);
if (message_type_is_link(rtm_type)) {
if (type == IFLA_LINKINFO)
if ((type == IFLA_LINKINFO && m->n_containers == 0) ||
(type == IFLA_INFO_DATA && m->n_containers == 1 &&
GET_CONTAINER(m, 0)->rta_type == IFLA_LINKINFO))
return add_rtattr(m, type, NULL, 0);
else
return -ENOTSUP;
@@ -727,9 +732,9 @@ int sd_rtnl_message_open_container(sd_rtnl_message *m, unsigned short type) {
int sd_rtnl_message_close_container(sd_rtnl_message *m) {
assert_return(m, -EINVAL);
assert_return(CURRENT_CONTAINER(m), -EINVAL);
assert_return(m->n_containers > 0, -EINVAL);
m->container_offset = 0;
m->n_containers --;
return 0;
}

7
src/libsystemd/sd-rtnl/test-rtnl.c
View File

@@ -214,7 +214,12 @@ static void test_container(void) {
assert(sd_rtnl_message_link_new(RTM_NEWLINK, 0, &m) >= 0);
assert(sd_rtnl_message_open_container(m, IFLA_LINKINFO) >= 0);
assert(sd_rtnl_message_open_container(m, IFLA_LINKINFO) == -EINVAL);
assert(sd_rtnl_message_open_container(m, IFLA_LINKINFO) == -ENOTSUP);
assert(sd_rtnl_message_append_string(m, IFLA_INFO_KIND, "kind") >= 0);
assert(sd_rtnl_message_open_container(m, IFLA_INFO_DATA) >= 0);
assert(sd_rtnl_message_open_container(m, IFLA_INFO_DATA) == -ENOTSUP);
assert(sd_rtnl_message_append_u16(m, IFLA_VLAN_ID, 100) >= 0);
assert(sd_rtnl_message_close_container(m) >= 0);
assert(sd_rtnl_message_append_string(m, IFLA_INFO_KIND, "kind") >= 0);
assert(sd_rtnl_message_close_container(m) >= 0);
assert(sd_rtnl_message_close_container(m) == -EINVAL);